Bementite
is a rare Manganese Silicate mineral that is found as
radiated or stellate crystals to massive granular forms
and often found in intricate intergrowths with other
minerals.

Bementite
localities are in the USA, at Franklin, Sussex County,
New Jersey; in Washington, on the Olympic Peninsula,
an ore mineral at a number of small deposits in Clallan,
Jefferson, and Mason Counties; from Ray, Pinal County,
Arizona; at Hale Creek, Trinity County, California;
and from the Black Diablo mine, Black Diablo district,
Pershing County, Nevada. In the Treburland mine, Altarnun,
Cornwall, and near Chillaten, Devon, England. From Langbån,
Värmland, Sweden. In Russia, at a number of poorly-defined
localities. In the Tokuzawa mine, Fukushima Prefecture;
the Ichinomata mine, Kumamoto Prefecture; and at Kunimiyama,
Kochi Prefecture, Japan. In the Wessels mine, near Kuruman,
Cape Province, South Africa.

Bementite
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